For one thing, the installation cost.do you think that in 2 or 3 years, charging stations will be all over (eg, 7-11, Costco, regular gas stations)? will it be like how ATMs are everywhere just so that the owner of the real estate can make $2 per withdrawal? Why wouldn't the same thing happen with EV chargers?
And unless you want to throw $100k+ out the door, you want the charging station to be busy. If most people "fuel up" at home 80%+ of the time, the demand is relatively low other than along travel routes. And those travel routes have massive spikes in demand over the holidays. Hence Tesla tries to get people to travel during off times during holidays.
Just a thought experiment. If you want to install a single 150kw charger, and it's $50k (maybe more), how long do you think it's going to take to make that back just charging for the electricity if the DCFV locations aren't generally busy?
(This is where I think having national State/Federal funding to help with the buildout and facilitate the initial economics is needed).